Help Needed : torque verification 1

[Zinov]

Hi everyone and Thanks for reading the post.
My hand calculation and FEA did not match at all for a new model I am working on it.
Therefore, I created a very simple model to make FEA verification. Surprisingly, the results did not match at all.
Please see the attached file for the details of the verification, I am doing.
The problem is very simple: It is a tube under pure torsion.
Solidworks results are much higher than theoretical expected values.
Can anyone explain the reasons of this discrepancy please?

Thanks for the help,
Zinov

 

[rumandcola]

You're looking at the von Mises stress while calculating the basic torsional shear. You need to define a radial shear stress plot or you could also look at the first principal stress.

 

[Zinov]

Thanks Rumandcola, can you please give me more details on how to do it?
Any reference, that can help, will be appreciated.
Thanks,
Zinov

 

[mmar2087]

You just need to make a new plot.
Right click the results folder and select "Define stress plot".

If you do a 1:st pricinpal stress plot i think that you will be very close to calculated 95,45 MPa

 

[Zinov]

Thanks mmar, it works, I am@95.6MPa with the new plot.
Thanks for the help,
Zinov